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Full Discussion: grep and alphanumerics
Top Forums Shell Programming and Scripting grep and alphanumerics Post 302722613 by Don Cragun on Sunday 28th of October 2012 03:44:23 AM
Old 10-28-2012
Quote:
Originally Posted by maverick_here
Have you gone through all my posts before coming to a conclusion.Please understand the question and then try to answer. Anyways, I figured out a solution my self.
Dear maverick_here,
Maybe you should go back and reread your posts. The title of this thread is grep and alphanumerics, not grep alphabetics and numerics. I pointed out that the RE you were using was matching and printing any line that contained any one of the characters ':', 'a', 'l', 'n', 'u', or 'm' rather than any alphanumeric character. You responded that the RE I suggested [[:alnum:]] also printed the lines:
Code:
data
sample data

and said that they are only lower case (which is not true since' 'is not a lowercase letter) and shouldn't matter since you said you wanted to match alphanumeric characters (and lowercase letters are alphanumeric characters).

The RE that you say works: [a-z][0-9]|[0-9][a-z], is not looking for an alphanumeric character; it is an ERE looking for a lowercase letter immediately followed by a decimal digit or a decimal digit immediately followed by a lowercase letter assuming that you are using a locale that is using a codeset that is a superset of ASCII. (But, since you used grep's -i option, grep will ignore case when looking for alphabetic characters.) If you are using an EBCDIC codeset, [a-z] will also match several characters that are not lowercase alphabetics, and if you are in a locale in which alphabetic characters includes letters with accents, [a-z] will not find the accented letters. If you had said that you wanted a portable ERE that would match a lowercase letter adjacent to a digit in the current locale in either order or an ERE that would match any letter adjacent to a digit in the current locale, I would have suggested:
Code:
grep -E '[[:lower:]][[:digit:]]|[[:digit:]][[:lower:]]' regexp

or
Code:
grep -E '[[:alpha:]][[:digit:]]|[[:digit:]][[:alpha:]]' regexp

respectively, but you never requested that.
 

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LEARN ABOUT HPUX

iswalnum

wctype(3C)																wctype(3C)

NAME

       wctype(),  iswalpha(),  iswblank(),  iswupper(),  iswlower(), iswdigit(), iswxdigit(), iswalnum(), iswspace(), iswpunct(), iswprint(), isw-
       graph(), iswcntrl(), iswctype() - classify wide characters

SYNOPSIS

   Remarks
       These functions are compliant with the XPG4 Worldwide Portability Interface wide-character classification  functions.   They  parallel  the
       8-bit character classification functions defined in ctype(3C).

DESCRIPTION

       These  functions classify wide character values according to the rules of the coded character set identified by the last successful call to
       (see setlocale(3C)).

       If has not been called successfully, characters are classified according to the rules of the default ASCII 7-bit coded character  set  (see
       setlocale(3C)).

       Each of the classification functions is a predicate that returns non-zero for true, zero for false.

       is  defined  for valid character class names as defined in the current locale.  charclass is a string identifying a generic character class
       for which codeset-specific type information is required.  The following class names are defined in  all	locales:  and  User-defined  class
       names may be specified if supported by the current locale as defined by (see setlocale(3C)).  returns a value of type that can be used in a
       subsequent call to or if charclass is not valid in the current locale.

       The classification functions return non-zero under the following circumstances, and zero otherwise:

	      wc		  has the property defined by prop.

	      wc		  is a letter.

	      wc		  is a blank character; that is a space or tab.

	      wc		  is an uppercase letter.

	      wc		  is a lowercase letter.

	      wc		  is a decimal digit (in ASCII: characters [0-9]).

	      wc		  is a hexadecimal digit (in ASCII: characters [0-9], [A-F] or [a-f]).

	      wc		  is an alphanumeric (letters or digits).

	      wc		  is a character that creates "white space" in displayed text (in ASCII: space, tab,  carriage	return,  new-line,
				  vertical tab, and form-feed).

	      wc		  is a punctuation character (in ASCII: any printing character except the space character(040), digits, letters).

	      wc		  is a printing character.

	      wc		  is a visible character (in ASCII: printing characters, excluding the space character(040)).

	      wc		  is a control character (in ASCII: character codes less than 040 and the delete character(0177)).

       If the argument to any of these functions is outside the domain of the function, the result is 0 (false).

       Definitions for these functions and the types and are provided in the header.

EXTERNAL INFLUENCES

   Locale
       The category determines the classification of character type.

   International Code Set Support
       Single-byte and multibyte character code sets are supported.

AUTHOR

       was developed by IBM, OSF, and HP.

SEE ALSO

       ctype(3C), multibyte(3C), setlocale(3C), ascii(5), thread_safety(5).

STANDARDS CONFORMANCE

																	wctype(3C)
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